Apparatus for avoiding complementarity in an encryption...

Details Apparatus for avoiding complementarity in an encryption... Apparatus for avoiding complementarity in an encryption...

H - Electricity

04

L

H04L 9/28 (2006.01) H04L 9/06 (2006.01) H04N 7/167 (2006.01)

Patent

CA 2136287

An implementation of a security algorithm such as DES is provided that overcomes the complementarity weaknesses provided by conventional implementations. In a DES implementation, a cryptographic processor applies the DES algorithm to a data block. The DES processor includes a first input port for receiving the data block, a second input port for receiving a cryptographic key, and an output port for outputting the data block after encryption. A nonlinear function that does not have complementarity is applied to at least one of the ports. The nonlinear function can comprise a lookup table, which could be advantageously derived from a DES S-Box.

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